I had one critical bug take 3 years to get a pay out. I had a full walkthrough with videos and report. The company kept stalling and at one point told me that because they completely had the app remade, they weren't going to pay me anything.
Hackerone doesn't really protect the researcher either. I was told multiple times that there was 'nothing they could do'.
I eventually got paid, but this is pretty normal behavior with regards to bug bounty. Too many companies use it for free security work.
Most companies should not do bug bounties.